National level
国调
Branch-grid level
网调
Provincial level
省调
Regional level
地调
County level
县调
2018/10/20
HUI REN @ NCEPU
45-17
National wide grid dispatching Inter-regional connection above 500 Kv 500 Kv substation 500(330)Kv transmission lines 220 Kv key substation 220 Kv transmission lines
HUI REN @ NCEPU
45-15
2018/10/20
HUI REN @ NCEPU
45-16
Power Dispatching
• Dispatching regulation on power system: issued in 1993 by State Council. • Unified dispatching and hierarchical management: five levels.
Provincial level
Medium and small scale plants
220 Kv substation 110Kv, 35 Kv substation 110Kv transmission lines and below
regional level
Distribution center High voltage customers
电力系统调度
2018/10/20
HUI REN @ NCEPU
45-2
2018/10/20
HUI REN @ NCEPU
45-3
2018/10/20
HUI REN @ NCEPU
45-4
2018/10/20
HUI REN @ NCEPU
45-5
2018/10/20
HUI REN @ NCEPU
County level
2018/10/20
HUI REN @ NCEPU
45-18
• Power dispatching automation system(调度自 动化系统). The task is providing to operators(调度员) all various kinds of real time information of power system, making management and dispatching decision to ensure safety and economical operation of power system. Sometimes it is also called EMS (Energy Management System)(能量管理20
HUI REN @ NCEPU
45-7
Basics
• DC/AC 直流/交流 • Voltage 电压 • Voltage level 电压等级
110v, 220v, 380v, 3kV, 6kV, 10kV, 20kV, 35kV 110kV, 220kV, 330kV, 500kV, 750kV, 1100kV
National level
Operation management of related large-scaled plants Coordinate economic operation of various branch grids
Branch-grid level Large-scaled plants
• Phase voltage 相电压, line voltage 线电压 • Active power（real power）有功功率 • Reactive power 无功功率
2018/10/20 HUI REN @ NCEPU
45-8
Basics
Y Y0 Δ
~ ~ ~ ~
Y Y0 Δ
Y0 Y Y0 Y0
电力专业英语
华北电力大学电力工程系
Power System Introduction
voltage current active power reactive power status of circuit breakers Status of protective relays ……
Power dispatchin g
HUI REN @ NCEPU
45-10
2018/10/20
HUI REN @ NCEPU
45-11
2018/10/20
HUI REN @ NCEPU
45-12
2018/10/20
HUI REN @ NCEPU
45-13
2018/10/20
HUI REN @ NCEPU
45-14
2018/10/20
2018/10/20
HUI REN @ NCEPU
Δ Δ
Δ
Y0 Y
Δ
~ ~
Y0
Y0
Δ
Δ
~
~
2018/10/20
HUI REN @ NCEPU
45-9
Basics
• • • • • • Generator Power Transformer Circuit breaker Protective Relay … Dispatching system
2018/10/20
2018/10/20
HUI REN @ NCEPU
45-19
• EMS includes the following power advanced software: Load Forecasting(负荷预测), Automated Generation Control(自动发电控制), State Estimation(状态估计), Transient Stability Analysis(暂态稳定分析), Optimal Power Flow(最优潮流), Dispatcher Training Simulator(调度员培训仿真系统)… • The basics of these advanced software is SCADA system.